Darwin Day 2018: To celebrate Darwin's 209th birthday, we present two lavishly produced albums of portrait photographs which Darwin received from continental admirers 141 years ago. These unusual gifts from Germany and the Netherlands are made available online for the first time through a collaboration with English Heritage and Cambridge University Digital Library.

Flowers, bloom, a son married . . . and a suspended monkey in Cambridge at Darwin's honorary LLD ceremony. Volume 25 of The Correspondence of Charles Darwin is now available. Read more about Darwin's life in 1877 here.

Darwin experienced his first earthquake in 1834, but it was a few months later that he was really confronted with their power. Travelling north along the coast of Chile, Darwin and Robert FitzRoy, captain of HMS Beagle, were confronted with a series of violent natural events that they were perfectly placed to study.

At the start of 1863, Charles Darwin was actively working on the manuscript of The variation of animals and plants under domestication, anticipating with excitement the construction of a hothouse to accommodate his increasingly varied botanical experiments, and continuing a massive scientific correspondence. Six months later the volume of his correspondence dropped markedly, reflecting a decline in his already weak health. Although Darwin worried about the effect of the quarrels on public perceptions, his theory was gathering support in influential scientific circles. He struggled with leaf angles, fractions, diagrams, and shoot dissections.

‘I am getting sick of insectivorous plants’ Darwin confessed in January1875. He had worked on the subject intermittently since 1859, and had been steadily engaged on a book manuscript for nine months. January also saw the conclusion of a bitter dispute with the zoologist St George Jackson Mivart. In April and early May, Darwin was occupied with a heated debate over vivisection, and at the end of the year, he campaigned vigorously on behalf of a young zoologist, whose blackballing by the Linnean Society infuriated him: ‘I have not felt so angry for years.’

Read and search the full texts of more than 9,000 of Charles Darwin’s letters, and ﬁnd information on 6,000 more. Discover complete transcripts of all known letters Darwin wrote and received up to the year 1873.